Alternator 4.4L V8 Petrol OE YLE500390 for Land Rover Discovery 3 Range Rover 2005-2009 Range Rover Sport 2005-2009

Product Description:

Alternator

OE NO.: YLE500390 LR008860 YLE500190

Applicable vehicle type: For Land Rover

The automotive alternator serves as the core component of the vehicle's electrical system, primarily responsible for supplying power to onboard electrical equipment whilst the engine is running and for recharging the battery.

The working principle of a car alternator is based on electromagnetic induction. Simply put, after the engine starts, the alternator's rotor (which generates a rotating magnetic field) is rotated by a belt. The magnetic field lines cut through the windings in the stator, thereby generating alternating current. The generated alternating current is then converted into direct current required by the car's electrical equipment and battery through a rectifier. To ensure that the voltage remains stable under different engine speeds, a voltage regulator is also equipped.

Fault: Alternato not generating electricity

Common Causes

1. Excitation System Failure:

• Brush wear excessive (thickness ≤ 3mm) or jammed, unable to contact the rotor collector ring;
• Excitation winding open circuit / short circuit (such as winding overheating and burning, insulation layer damage);
• Voltage regulator failure (internal electronic components burned out, unable to control excitation current).

2. Generator Winding Failure:

• Stator three-phase winding open circuit (wire joint loosening) or short circuit (insulation breakdown between windings);
• Stator core damage (such as core sheet loosening, overheating deformation, leading to reduced magnetic flux).

3. Mechanical Transmission Failure:

• Generator belt is broken or slipping (unable to drive the rotor rotation);
• Rotor shaft jammed (severe bearing wear, internal jamming, unable to rotate).

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